package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = categoryDao.selectList(null);
        //2。组装父子结构
        List<CategoryEntity> laveloneMenus = entities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).map((menu) ->{
            menu.setChildrren(getChildrens(menu,entities));
            return  menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0: menu1.getSort()) - (menu2.getSort()==null?0: menu2.getSort());
        }).collect(Collectors.toList());


        return laveloneMenus;
    }

    @Override
    public void removeMenuByIds(List<Long> catIds) {

        categoryDao.deleteBatchIds(catIds);
    }

    //递归查找子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map((categoryEntity)->{
            categoryEntity.setChildrren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0: menu1.getSort()) - (menu2.getSort()==null?0: menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}